navController navigateForward with string url

I have a string link like request?subCategoryId=172.

this.navCtrl.navigateForward(['request?subCategoryId=172']);

I treid to navigate with navController but throws below error

Cannot match any routes. URL Segment: 'request%3FsubCategoryId%3D172'

how to navigate with string url ?

I dont recomended use ? in Routes with ionic.